Making games is so unbelievably expensive these days many smaller studio's end up having to close if they're game doesn't sell well.
I can totally understand why developers are trying to fight used game sales, especially with Gamestop being so predominant.
I think they're best bet however is to adopt a steam model or downloadable distribution, which is happening more on PSN, but unfortunately because of Microsofts limitations, isn't as easy on XBL.
I think it will be the primary distribution method come next gen/
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